which file control the connection to database.!?

What I meant is that I used ( before using WP ) to put Under construction.jpg as index.html until I finish developing my site then I replace the the jpg with the landing page of my web site..!!

I’m asking instead to move wp files from place to place and using plugin to redirect my images to the new location..!!!! should be parking page in WP to save too much time for everyone…!!!